The 28-year-old Dancing with the Stars pro showed off how much his body changed following the last season.

“After season 18 of @dancingabc I took 3 months off, no exercise or diet & I gained about 10lbs,” Markcaptioned it. “These are my before and after pics of me and my progress during season 19 of #DWTS I took these pics on day one of rehearsal and the day after the final.”

Mark continued, “I lost 11lbs and tightened everything up from just dancing and eating semi-clean. I forget sometimes how great of a work out dancing is, if your trying to change your body this year and love dance, go take some classes you’ll be amazed at what dancing to music you love can do to change your body and life.. #youcandoit #transformationtuesday #dance2getfit”